John: Sorry, my previous post went out prematurely.
The question is: how bad is the noise? I’ve heard buzzing to some degree or another from most transformers. Is the noise level the same without any covers in place? Pumps lose efficiency over time. Could the pump be drawing more power? If there has been regularly service pump efficiency should have been logged. William Miller Miller Solar.com 805-438-5600 www.millersolar.com On Thu, Jan 23, 2025 at 7:44 PM John Blittersdorf via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > The only thing I could find in the whole system that was not up to snuff > was incomplete separation of neutrals and grounds in the sub-panel. In > other words more than one ground to neutral bond. But the fact remains that > this > system worked flawlessly for 26 years! I also removed the ground wire > from the transformer but still no difference. What am I missing? > > On Thu, Jan 23, 2025 at 10:35 PM John Blittersdorf < > john.blittersd...@gmail.com> wrote: > >> Steve, I took my scope meter today and checked wave forms at all >> points. All were clean sine waves. I checked the breaker connections and >> all connections back to the inverter and all were tight. >> Voltage drop when pump kicked on was small and only about 1 volt when >> running. Amp were 12 on both legs. >> >> On Thu, Jan 23, 2025 at 9:48 AM Jay via RE-wrenches < >> re-wrenches@lists.re-wrenches.org> wrote: >> >>> Are the amps leg the same? >>> Jay >>> >>> On Jan 22, 2025, at 9:29 PM, Steve Higgins via RE-wrenches < >>> re-wrenches@lists.re-wrenches.org> wrote: >>> >>> >>> How do their clocks run? Is the Xfmer quiet down when the generator >>> runs? >>> >>> If you have an O-scope, check the output waveform off the inverter. My >>> guess is that the output waveform will be deformed, causing extra noise for >>> the Xfmer. You might be able to see this on the frequency as well. It >>> should be solid at 60Hz, but if it's drifting or way off the high side, >>> FETS have probably failed. >>> >>> If you pull the top cover off the inverter the and you look at the FET >>> board, it'll be the fets closest to the Fan on the AC board. >>> >>> >>> <image.png> >>> >>> Steve Higgins >>> >>> >>> >>> >>> On Wed, Jan 22, 2025 at 7:32 PM John Blittersdorf via RE-wrenches < >>> re-wrenches@lists.re-wrenches.org> wrote: >>> >>>> Christopher, >>>> Update on the Transformer Humming. Installed a new PSX-240 from Kirk >>>> and it is LOUDER than the T-240 that I took out. >>>> I have a call into the well driller to see if they have a record of the >>>> pump size or other details. When connected >>>> directly to the grid via transfer switch, still loud noise... same with >>>> battery only. I did not check the 120VAC 30 amp break >>>> in the backed up loads sub panel. All other wiring was redone as I >>>> switched the pump directly to the grid until I received the >>>> new transformer and back to the inverter again. so all the connections >>>> were redone except the 120 breaker. >>>> >>>> John >>>> >>>> >>>> On Wed, Jan 22, 2025 at 10:30 AM Howie Michaelson via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>>> John, >>>>> If you need a T240 (internal or external), I have a few used ones (and >>>>> maybe a new one) in storage. >>>>> Howie >>>>> >>>>> >>>>> On Wed, Jan 22, 2025, 10:14 AM Christopher Warfel via RE-wrenches < >>>>> re-wrenches@lists.re-wrenches.org> wrote: >>>>> >>>>>> I could be a loose electrical or mechanical connection. It's been >>>>>> installed for a while and connections could have loosened up from >>>>>> expansion and contraction. >>>>>> >>>>>> On 1/18/2025 9:06 AM, John Blittersdorf via RE-wrenches wrote: >>>>>> > Hi Wrenches, >>>>>> > I have a customer with an SW4024 installed in 2003 with the Trace >>>>>> > T220 transformer for >>>>>> > her well pump. Recently it has started making a lot of noise when >>>>>> the >>>>>> > well pump comes on. >>>>>> > I checked the current on the well pump and it seems to be in the >>>>>> > normal range. I have never had a transformer failure. Could this >>>>>> be a >>>>>> > failing transformer? >>>>>> > >>>>>> > Also, I have not been able to source a new one (Outback T240). Are >>>>>> > there other brands >>>>>> > some of you may have used for a step up transformer? >>>>>> > >>>>>> > John Blittersdorf >>>>>> > >>>>>> > _______________________________________________ >>>>>> > List sponsored by Redwood Alliance >>>>>> > >>>>>> > Pay optional member dues here: http://re-wrenches.org >>>>>> > >>>>>> > List Address: RE-wrenches@lists.re-wrenches.org >>>>>> > >>>>>> > Change listserver email address & settings: >>>>>> > >>>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>>>> > >>>>>> > There are two list archives for searching. When one doesn't work, >>>>>> try the other: >>>>>> > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>>>>> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>>>> > >>>>>> > List rules & etiquette: >>>>>> > http://www.re-wrenches.org/etiquette.htm >>>>>> > >>>>>> > Check out or update participant bios: >>>>>> > http://www.members.re-wrenches.org >>>>>> > >>>>>> -- >>>>>> Christopher Warfel, PE >>>>>> ENTECH Engineering, Inc. >>>>>> PO Box 871, Block Island, RI 02807 >>>>>> (401) 447-5773 >>>>>> >>>>>> _______________________________________________ >>>>>> List sponsored by Redwood Alliance >>>>>> >>>>>> Pay optional member dues here: http://re-wrenches.org >>>>>> >>>>>> List Address: RE-wrenches@lists.re-wrenches.org >>>>>> >>>>>> Change listserver email address & settings: >>>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>>>> >>>>>> There are two list archives for searching. 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